Orexins mitigate obesity-associated dysfunctions in mice

Area of Science:

• Neuroscience
• Metabolic Research
• Obesity Studies

Background:

• Obesity is a widespread chronic disease with significant comorbidities.
• Orexins, hypothalamic neuropeptides, play a role in physiological processes linked to obesity.

Purpose of the Study:

• To investigate the effects of chronic orexin-A administration in mouse models of obesity.
• To evaluate the role of orexin signaling in metabolic flexibility.

Main Methods:

• Utilized obesity-prone and resistant C57BL/6 mice, and orexin receptor-deficient mice fed a high-fat diet.
• Assessed glucose tolerance, indirect calorimetry, neuropeptide/receptor expression, microglial activation, and gut microbiota.

Main Results:

• Orexin-A administration decreased weight gain, body fat, food intake, and insulin resistance in obesity-prone mice.
• Observed alterations in intestinal microbiota composition and reduced hypothalamic expression of orexin receptors and feeding-related neuropeptides.
• Orexin-A treatment mitigated steatosis and improved metabolic flexibility.

Conclusions:

• Orexin receptor signaling is implicated in energy metabolism regulation.
• Targeting orexin receptors may offer a novel therapeutic strategy for managing obesity and associated metabolic dysfunctions.